<!doctype html>
<html>
<head>
  <title>Network | Basic usage</title>

  <script type="text/javascript" src="../../../dist/vis.js"></script>
  <link href="../../../dist/vis-network.min.css" rel="stylesheet" type="text/css"/>

  <style type="text/css">
    #mynetwork {
      width: 600px;
      height: 400px;
      border: 1px solid lightgray;
    }

    p {
      max-width:600px;
    }
  </style>
</head>
<body>

<p>
  You can draw on the canvas using normal HTML5 canvas functions. The before drawing will be behind the network, the after drawing will be in front of the network.
</p>

<div id="mynetwork"></div>
<pre id="eventSpan"></pre>
<script type="text/javascript">
  // create an array with nodes
  var nodes = new vis.DataSet([
    {id: 1, label: 'Node 1'},
    {id: 2, label: 'Node 2'},
    {id: 3, label: 'Node 3'},
    {id: 4, label: 'Node 4'},
    {id: 5, label: 'Node 5'}
  ]);

  // create an array with edges
  var edges = new vis.DataSet([
    {from: 1, to: 3},
    {from: 1, to: 2},
    {from: 2, to: 4},
    {from: 2, to: 5}
  ]);

  // create a network
  var container = document.getElementById('mynetwork');
  var data = {
    nodes: nodes,
    edges: edges
  };
  var options = {};
  var network = new vis.Network(container, data, options);

  network.on("initRedraw", function () {
    // do something like move some custom elements?
  });
  network.on("beforeDrawing", function (ctx) {
    var nodeId = 1;
    var nodePosition = network.getPositions([nodeId]);
    ctx.strokeStyle = '#A6D5F7';
    ctx.fillStyle = '#294475';
    ctx.circle(nodePosition[nodeId].x, nodePosition[nodeId].y,50);
    ctx.fill();
    ctx.stroke();
  });
  network.on("afterDrawing", function (ctx) {
    var nodeId = 1;
    var nodePosition = network.getPositions([nodeId]);
    ctx.strokeStyle = '#294475';
    ctx.lineWidth = 4;
    ctx.fillStyle = '#A6D5F7';
    ctx.circle(nodePosition[nodeId].x, nodePosition[nodeId].y,20);
    ctx.fill();
    ctx.stroke();
  });

</script>


</body>
</html>
